Endless - Vine's Expository Dictionary of New Testament Words
Endless[ 1,,G179, akatalutos ]
denotes indissoluble (from a, negative, kata, down," luo, "to loose"), Hebrews 7:16, "endless;" See the RV, marg., i.e., a life which makes its possessor the holder of His priestly office for evermore.
[ 2,,G562, aperantos ]
from a, negative and peraino, "to complete, finish," signifies "interminable, endless;" it is said of genealogies, 1 Timothy 1:4. In the Sept., Job 36:26.